You don't need to stab it with a fork, you just need to let it sit in the marinade for 2 hours.
Start slowly so you don't burn out. Work on a 2 day split for the first month, Upper body and lower. Monday do Lower Body + Abs. Hit your quads, hammies, calves, glutes. Friday do Upper body + Abs. Arms, shoulders, chest, back.
You can do the ab work outs at home.
Keep it simple but push your body. Do this for a month consistently (no fucking excuses), get passed the DOMS and then you will be ready.
Take a photo of your body from day 1 and then day 30 and every month following that. When you see the progress, it will motivate you.